There is event to put plant and citrus fruits bringing effect good for the health in the hot water in sento of Tokyo, and to take a bath.
(※). that May 5, citron hot water carries out lavender hot water as for the sweet-flag bath every year every year on day of sento on October 10 on day (around December 22) of winter solstice
(※) Lavender bath may vary in conduct day by area and shop.
As equivoque, we celebrated May 5 as seasonal day of Naotake, but are informed "iris" and "Naotake" in the Edo era, samurai family society when this is beginning of "the Boy's Festival". It became one of the annual functions in custom gradually that took a bath that we put calamus and leaf on that day and excited. Opinion to date back to China has history of sweet-flag bath in fact. In the first place it was thought that sweet flag was medicinal herb to pay illness to from old days. When Chinese people pray description of annual function "ibaraso (keiso) compendium of seasonal words" (saijiki) of the sixth century in China for longevity and health for a long time and used sweet flag, it is written down. It is time when it is easy to fall sick at the turn of the seasons from spring to summer on day of Iris Festival. Therefore day of Iris Festival seemed to have many sweet rush liqueur, sweet-flag bath, manners and customs using sweet flag including wooden sword for ornament.
■Citron hot water
In Japan, there is custom to take a bath in Yubune where we floated citron on on day (every year about December 21) of winter solstice from the Edo era. Citron hot water means this, but bathroom is filled with sweet smell peculiar to citrus fruit system.
We are said "not to catch cold when we can enter citron bath" from old days and are handed down even if we prevent crack and chap that are winter skin symptom. It is "hot spring cure" and game of rhyming of "winter solstice", and there is strained opinion which we use citron for because "we are flexible if it is physical staying young" for another view, but it is not revealed that we are reliable.
As ingredient which stimulates capillary, and promotes metabolism is included in essential oil bringing on fragrance of citron, it is hard to feel a chill after a bath and is said to be when there is an effect for poor circulation and rheumatism, neuralgia, low back pain, sprain, relieving fatigue.
Citron of winter solstice became custom before in each family, but is not performed too much recently. It may be said that sento of Tokyo continues following this culture exclusively.
■Lavender hot water
Lavender hot water is one of the herb baths performed widely in Europe. Good herb of fragrance that lavender produces purple flower. Ingredients provoking sound sleep are included in essential oil ingredient laying groundwork for fragrance of lavender abundantly. Therefore mental and physical relaxation, superior effect including improvement of immunity are known.
In Tokyo Sento Association, we performed sweet-flag bath and Japanese traditional herb bath called citron hot water, but we decided to take in overseas bathing culture while globalization advanced and carried out the first lavender hot water in (※) on "day of sento" on October 10, 1995. We follow as event to memorialize day of sento every year afterward until today. We use thing which dried flower stalk of lavender cultivated in Nakafurano-cho of Hokkaido for lavender hot water to perform in sento of Tokyo.
(※) What is it on day of sento?
October 10 (former Health Sports Day) is day when the Olympics were held for the first time in our country in 1964.
Will to sports of the nation increases with this, and population playing sports for health increases year by year. Because it is proved by experiment that taking a bath after having sweated by sports and bathing in sento are good for health, it may be said that sports and bathing are related closely.
By such a reason, we applied to association for October 10 (1010 = sen canes) on Japanese memorial day as "day of sento", and we were authorized formally in 1996 by the association.
※We were changed on second Monday of October from 2000 in Health Sports Day by law revision of 1998.